Appendicular abscess and gangrene is one of the serious complications of acute appendicitis. Kerstersia gyiorum (K. gyiorum) is a rare bacteria, one patient with acute appendicitis was admitted to a hospital, patient's appendicular pus cultured and isolated a kind of flat, pale grey, dry, opaque, marginal diffuse bacterial colony, which was identified as K. gyiorum by mass spectrometry and 16S rRNA gene sequencing, after emergency surgery and sensitive drug treatment, patient was successfully cured. This paper reports and conducts literature review on a rare case of appendicular abscess caused by K. gyiorum.